Question

A 6.5 m ladder leans against a wall, making an angle of 60o with the ground. If the foot of the ladder is

push 75 cm closer to the wall in Figure 1, how far will the ladder slide up the wall?

Answer 1

$s_1=l\cos60°=3.25~m,$

$h_1=l\sin60°=5.63~m;$

$s_2=s_1-s_0=2.50~m,$

$h_2=\sqrt{l^2-s_2^2}=6.00~m;$

$∆h=h_2-h_1=0.37~m.$